I got a msg on my dash that read "stabilitrak off", then "check brakes". Took it in & they tell me the master cylinder was leaking brake fluid & it leaked right onto the brake booster (design flaw maybe?) so I had to replace both master cylinder & booster to the tune of $1100! Not too happy with it at all. Definitely won't be purchasing another GM vehicle in the future! Never had any issues with my Honda. Should've stuck with them!

Service brake system message, sometimes Service Stability, red brake light and TRAC OFF message.
These are sometimes the result of low brake fluid, but no obvious leaks are noted. Due to the design of the master cylinder and brake booster, the master cylinder can leak from the rear seal and collect inside the booster, leaving no drops on the ground or obvious signs.

problem with brake booster full of braks fluid from master cylinder leak $1200.00 repair talked to GM found no satisfaction on repairs even service rep said it is a problem he has seen a lot no help from GM. not buying another GM toyota looking better all the time

At such low mileage it is extremely disappointing to have this same problem (at the tune of $1000), which naturally started just after the warranty period expired. I am also experiencing the steering wheel noise problem($1400)and noises from worn out lower control arm bushings($800). My recommendation is either not buy a GM (government motors)vehicle or unload it before the end of the warranty period. You can also get the 2 year extended warranty for about $3500. I will never buy another GM vehicle again.

problem with brake booster full of braks fluid from master cylinder leak $1200.00 repair talked to GM found no satisfaction on repairs even service rep said it is a problem he has seen a lot no help from GM. not buying another GM toyota looking better all the time

At such low mileage it is extremely disappointing to have this same problem (at the tune of $1000), which naturally started just after the warranty period expired. I am also experiencing the steering wheel noise problem($1400)and noises from worn out lower control arm bushings($800). My recommendation is either not buy a GM (government motors)vehicle or unload it before the end of the warranty period. You can also get the 2 year extended warranty for about $3500. I will never buy another GM vehicle again.

Brake works fine sometimes, but just started failing last week. I apply the breaks and it goes all the way down but car does not stop. Need to pump brake and then it stops. It freaks me out! Diagnosis is to replace booster and master cylinder for $714 at dealership. Not fun since just replaced the transmission at 101K mi for same Acadia for $3,300. What's next?